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Plant profile · Austin & Hill Country

Fire on the Mountain

Euphorbia cyathophora
native · Hill Countrytoxic

Fire on the Mountain is an annual wildflower native to the Texas Hill Country that grows 1–3 ft tall and 3 ft wide. It wants full sun and medium water, and handles clay soil. Blooms yellow and green in May–Nov. Good for bees and butterflies.

Toxic — people, pets, livestock. Milky sap irritates skin and is painful in the eyes; toxic if eaten. Wear gloves to cut it and wash hands after. Applies to every spurge, including snow-on-the-mountain and snow-on-the-prairie.

Will it grow in your yard?

Enter your ZIP. The finder checks Fire on the Mountain against your microclimate, then ranks it against your sun, your watering and deer pressure.

The facts

4 sources
Type
Annual wildflower
Sun
Full sun (6–8 hrs of direct sun)
Water
Medium
Height
1–3 ft
Spread
3 ft
Bloom
May–Nov · yellow, green
Foliage
Deciduous or dies back in winter
Soil
Takes clay · recorded on clay, loam, moist, sand
Wildlife
Supports bees and butterflies

Where it grows

Recorded in these EPA Level IV ecoregions in the Austin and Hill Country launch area:

Balcones CanyonlandsLlano UpliftEdwards Plateau WoodlandNorthern Blackland Prairie

Can you buy it?

Also grows here — hard to find. Native and recorded growing in Central Texas, but not on the grower stock lists we read. Sourcing varies: some are stocked widely, others you will have to hunt for.

also grows from seed It starts readily from seed, so a packet from a native-seed supplier, or seed collected with permission, is often the easiest way to get a plant no nursery pots.